Pressure bar for veneer machines



Feb. 16, 1932. OSGOOD 1,846,515

PRESSURE BAR FOR VENEER MACHINES Filed April 21) 1930 g %%%mmmmmmmmv tor"m Patented Feb 16, 1932 I Gnonen n. osooon, or rncorre, wnsnrne'ronrnnssnnn nan necnrnns Application filed April 21, 1930. Serialtress-sees.

My invention relates to machines for slic- In the following descriptionof my inven ing or cutting a sheet of venee from a block tion itsapplication to a rotary veneer maof wood, and has special reference tothe chine or lathe is described in detail, but it is pressure barthereof which engages the wood to be understood that it may be used onrecat a point adjacent to but spaced from the tilinear machines, orslicers, with suitable 55 cutting edge of the knife, to prevent themodifications which will be easily understood splitting or breaking ofthe wood. The oband apparent to those skilled in the art. jects of myinvention are to provide a pros in veneer lathes, the pressure bar,which sure bar wherein the strain-bearing member bears against the woodadjacent to and in is adapted to receive either a rotary pressure ii.rel on to the knife, is carried by the co member or a fixed nose-plate;and wherein yore 1, and is supported by means of two horithestrain-bearing member aojustably' supzontal lugs 2 its ends, said lugsfitting in ports the pressure member throughout its on and adapf ed beadjust-ably slid in suitable tire length to carry the pressure reactionbegrooves 8 in the tines of the said tween the wood and said pressuremember 1. The position of the pressure bar c5 without producingexcessive friction orbendhin thesaid yoke l is controlled by means ingaction therein. Further objects of my of heavy screws 4 between the saidparts. The invention are, to provide means of connectyoke l is suitablymoved to keep the pressure ing the gearing which drives the rotating barin constant relation to the veneer cutting 21 pressure member with saidpressure member; lzl'llffi. 70 to provide means for preventing thechatter- The pressure bar comprises a heavy horiing of the pressuremember to provide means Zontal plate 5 extending the entire width of forsupporting the driving motor on the the machine between the tines of theyoke 1, pressure bar; and to pro 'ide a bar which is and having its1113-101 cross-sectional dimen- J simple in construction, easy to repairor res1on horizontal and lying preferably sl ghtplace the wearingsurface, stiff and strong ly above the point of application of thepresin construction, and'which effectively prosure to th veneer. Thefront end of this duces a smooth and uniform sheet of veneer. to 5 isenlarged both upward and down- I attain these and other objects by the i:d to form ahead 6, said enlargements bedevices, mechanisms, andarrangements illus- 111g pr p r g amplemetal to 0511 trated in theaccompanying drawings, in ry the stresses developed therein by the ophih v Lion of the machine. This head 6 is pro- Fig. 1 is a plan view of myimproved pres- V ed with a lower horizontal slot 7 whose sure barmounted in the usual carrier yoke; flf axis 119? g v below @116Pal'allel F ig. 2 is a front elevation of the right-hand line throughthe point of contact with the s; end of the pressure bar, showingtheover- WOOd- 11%6} 18 0 PiOV W l h i arrangemeng f Supporting th upperinclined slot 8 extending upward and motor, and showing the devices forconnectb t degrees to the hOllZOII- ing the driving chain gear to thedriven presm1 9 Central 3X15 hes l y above 40 Sure member in io Fi 3 i9, ti l th parallei line through the point of contact cross-section ofthe pressure bar, showing the 1 the i e h ye' 5111s P 18 $196k motor andits supporting attachment in side 41141 f y 3 f is hgnt 1n90111132111303 l elevation; Fig. 4 is a section of a portion of i fmembels of {WHEY the pressure bar showing its adaptation for Wluhsut 8;y substa-ntlal degree use with a nose plate; and Fig. 5 is a similar iewshowing a n' odified form of 111821115 {01- (ilOllgh t0 CfllTy llhQStTQSSQS developed V holding the pressure member in the pressure thepressure on the wood, and 1t further has a bar. great advantage in beingmuch easier to cast I Similar numerals of reference refer to and tofinish. I f

similar parts throughout the several views. VJhcn the character of thewood c emands angles to the axis of the block i i.

,vplate 19 extending from end to end of a driven pressure rod 9 (Fig. 3)to contact with the block from which the veneer is being stripped thenthe pressure is applied thereto through a series of separate pressureblocks 10 lying within the said horizontal slot 7 and grooved at theirupper forward edges to receive the lower portion of the said pressurerod 9. Similarly the said red 9 is held down on the said blocks 10 bymeans of the series of seJa-rate blocks 11 lying within the said inclined slot 8. Each of said blocks 10 and 11 are independentlyadjustable by means of independent backing screws 12 passing; throughthe enlargements forming the head 6 of the bar 5. The stresses from thepressure of the rod 9 on the wood are therefore carried by the severalblocks 10 and 11 to the bar through the said screws 12. The pressure rod9 is of small dia neter, about one-half inch being usual and, being somenine feet long, has substantially no strength to resist the pressureapplied through it to the wood, hence itis necessary that it besupported by the blocks and 11 all points in its length and, since thewear of the rod 9 cannot be en tirely uniform from end to end, it isevident that the said blocks must be separately adjustable However, inorder to provide a certain degree of continr y between the adjacentblocks I prefer to insert a strip 13 of thin metal in the slots 7 and 8,between the said blocks 10 or 11 an L the screws 12 \Vhen it is desiredthat the rod 9 be stationary, then the two sets of blocks 10 and 11 areforced outward slightly by their screws and therefore pinch the said rod9 and prevent its rotation, thereby makig a Contact surface which isrenewable when worn, by simply turning the rod.

In certain cases the above-described means of supporting the rod 9 maybe modified as shown in Fig. 5. he blocks 10 and ll, above described,are herein substituted by a compound blocl: comprising a main block 14,-

whose front or outer portion is cut to about one-h alf the thickness ofthe rear end, which fits in the slot 7. A supplemental block 15 fits insaid cutaway portion and agroove 16 is cut in tire contiguous outer eges of both said blocks 14; and 15, to receive the rod 9. The rearconnection between said blocks i i and 15 is formed with a shoulder 17,at it- The two said blocks may be fastened together by means of thescrews 18, whereby the rod 9 is prevented from chattering when inoperation. A further modification of my invention illustrated in Fig. l,wherein the rod 9 and block 10 are substituted by a single nose han slot7 and shaped to have a sliding contact with the wood without materiallydamaging the wood as it is slld there east. This nose slot 7 by means ofthe hold-down blocks 11, as in 3.

Since the pressure bar 5 must extend the full width of the wood to beengaged by the knife, it is evident that any means for independentlydriving the roller or rod 9 must be mounted beyond one end of the saidbar. For this purpose 1 form a pad or platform 20 at one end of the barand secure thereon a casting 21, which is provided with an over-'hanging cantilever part 22 adapted to receive the electric motor 23,which drives the rod 9 through the chain belt 2 L enclosed in the protective casing 25. A hanger 26 extends down from the forward-extendingpart of the casting 21 and is provided with suitable bearings for theend of the rod 9, thereby making a strong and still connection betweenthe motor shaft and the rod 9 to prevent undue strain on the rod throughthe action of the said chain belt 2%.

However, on account of the fact that the rod 9- is very small diameterit is not practical either to mount the gear wheel, driven by the saidbelt 2d, directly thereon, nor to provide it with suitable thrusthearings in said hanger 26, therefore 1 have invented the constructionshown particularly in Fig. 2, wherein a sleeve 27 its tightly on and iskey to the said rod This sleeve 27 is a with a boss 28, formed integrali, at its inner end. A gear wheel ed tightly on and is keyed to the saidboss 28; V Conical roller bearings 30 are suitably mounted veen thesleeve 27 and the bearing cavity in the end of the hanger 26. Thus itwill be seen that by this means I have provided a suitable thrustbearing for the rod 9 in the hanger 26 and a suitable gear wheel adaptedto be engaged by the teeth of the chain belt 24 and that therefore thesaid rod 9 is prevented from end movement in the machine, is prope lyheld from bending by the bearing in the hanger, and is rotated by thebelt.

Having described my invention, what I claim and desire to secure byLetters Patent, is. I

In a pressure bar for veneer machines, the combination of astress-bearing member; a pressure block mounted therein; a pressure rodsupported along its entire working length by said pressure block and oneend extending beyond the end of said stress-bearing mem her; a singlesleeve mounted on and secured to the said extended end'of said pressurerod beyond the end of said pressure block; a single thrust bearing forsaid sleeve, and attached to but mounted beyond the end ofstress-bearing member; a motor mounted said stress-bearingmember; anddriving means connecting said motor to said sleeve, engaging said sleevebetween said bearing and said pressure block.

plate 19 may be held from chattering in the GEORGE H. OSGOOD. 3O

